4. Apply a flux to the outside of the tube and inside of the cup of the fitting carefully so that surfaces to be joined are completely covered. USE FLUX SPARINGLY.

5.Insert tube end into fitting cup, making sure that the tube is seated against the base of the fitting cup. A slight twisting motion ensures even coverage by the flux.

6. Apply a flame perpendicular to the tube. Next move the flame onto the fitting in the cup area. When the solder begins to melt, apply heat to the base of the cup to aid capillary action in drawing the molten solder into the cup towards the heat source.

7. When soldering the tee remember to keep a proper order of connection depending on the position within the system.

8. Allow the completed joint to cool naturally. When cool, wipe off any remaining flux with a wet cloth.

BRAZING a joining process wherein coalescence is produced by heating, usually between 590° C and 815" C, and by using a non-ferrous filler metal that has a melting point below that of the tube or fitting. The filler metal is distributed between the closely fitted surfaces of the joint by capillary attraction.

Brazing is applicable in:

central heating systems with a working temperature in excess of 110.C.

gas systems

compressed air and oil systems

The procedure for brazing is very much like that described for soldering. However, brazing does require a greater amount of heat to be supplied to the joint.